Monday, October 29, 2012

Have you heard?

People aren’t the only ones with interesting hearing mechanisms and facts. Check out these random tidbits about animal hearing from the Better Hearing Institute, Teachers Domain, and the University of Washington:

Snakes do not have ears, but their tongues are sensitive to sound vibrations.

Owls distinguish sound directions partly by measuring the difference in time it takes the sound to reach each ear. This difference is typically less than 200 millionths of a second!

Cicadas have hearing organs in their stomachs

Crickets have hearing organs in their knees; sound waves cause a thin membrane on the cricket’s legs to vibrate

It is thought that owls can create an image of the world around them based only on sound, much like humans do with their eyes

Although fish do not have ears, they can hear pressure changes through ridges on their bodies

Dolphins can hear frequencies up to at least 100,000 Hz. Compare this to a dog’s ability to hear up to 40,000 Hz and a person’s 20,000 Hz

During World War I, the military kept parrots on France’s Eiffel Tower because their extra-sensitive hearing allowed them to warn of incoming enemy aircraft before any person could hear it

All mammals have external ears, but many can move them to help pinpoint the direction of sounds. Some animals, like elephants, can even use their ears to stay cool by waving them like fans. And you thought you could twitch your ears!

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